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Mobile QR Reader Software

UPDATED:  My recommendation for a free and fantastic app for iPhone is Red laser. Great for shopping, but also useful for general purpose codes.  Try it.

Here are some other free apps for your mobile devices. They mostly work the same way: Start the app, snap a photo of the code, software decodes the QR code, you're taken to the URL. These are in no particular order-- I suggest you try a few and see which you like best for your device.